structuredAttrs is enabled

trying https://crates.io/api/v1/crates/gmp-mpfr-sys/1.7.1/download
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
  0      0   0      0   0      0      0      0                              0
100  5.35M 100  5.35M   0      0 17.69M      0                              0